// Remove padding of 'padfile' from a range of address space.
void as_unpad(void *start, void *end, int padfile)
{
static struct stat padstat;
killpad_extra extra;
int res;
assert(padfile > 0);
res = fstat(padfile, &padstat);
assert(0 == res);
extra.killpad_padstat = &padstat;
extra.killpad_start = start;
extra.killpad_end = end;
foreach_map(killpad, &extra);
}
// Pad all the empty spaces in a range of address space to stop interlopers.
void as_pad(void *start, void *end, int padfile)
{
fillgap_extra extra;
extra.fillgap_start = start;
extra.fillgap_end = end;
extra.fillgap_padfile = padfile;
foreach_map(fillgap, &extra);
if (extra.fillgap_start < extra.fillgap_end) {
void* res = mmap(extra.fillgap_start,
extra.fillgap_end - extra.fillgap_start,
PROT_NONE, MAP_FIXED|MAP_PRIVATE, padfile, 0);
check_mmap(res, extra.fillgap_start,
extra.fillgap_end - extra.fillgap_start);
}
}
static void main2(void)
{
int err, padfile;
struct exeinfo info;
extern char _end;
int *esp;
char buf[strlen(valgrind_lib) + sizeof(stage2) + 16];
info.exe_end = VG_PGROUNDDN(init_sp); // rounding down
info.exe_base = KICKSTART_BASE;
printf("info.exe_end = %p\n", info.exe_end);
#ifdef HAVE_PIE
info.exe_base = VG_ROUNDDN(info.exe_end - 0x02000000, 0x10000000);
assert(info.exe_base >= VG_PGROUNDUP(&_end));
info.map_base = info.exe_base + 0x01000000 ;
#else
// If this system doesn't have PIE (position-independent executables),
// we have to choose a hardwired location for stage2.
// info.exe_base = VG_PGROUNDUP(&_end);
printf("info.exe_base = %p\n", info.exe_base);
info.map_base = KICKSTART_BASE + 0x01000000 ;
printf("info.map_base = %p\n", info.map_base);
#endif
info.argv = NULL;
snprintf(buf, sizeof(buf), "%s/%s", valgrind_lib, stage2);
printf("valgrind_lib = %s\n",valgrind_lib);
err = do_exec(buf, &info);
if (err != 0) {
fprintf(stderr, "valgrind: failed to load %s: %s\n",
buf, strerror(err));
exit(1);
}
/* Make sure stage2's dynamic linker can't tromp on the lower part
of the address space. */
padfile = as_openpadfile();
as_pad(0, (void *)info.map_base, padfile); // map base is the start of our stuff
printf("init sp : %x\n", init_sp);
esp = fix_auxv(init_sp, &info, padfile);
printf("after fix_auxb\n");
if (1) {
printf("---------- launch stage 2 ----------\n");
printf("eip=%p esp=%p\n", (void *)info.init_eip, esp);
foreach_map(prmap, /*dummy*/NULL);
}
VG_(debugLog)(1, "stage1", "main2(): starting stage2\n");
printf("jumping to stage 2 \n");
printf("esp : %x \n eip : %x\n",esp, info.init_eip);
jump_and_switch_stacks(
(Addr) esp, /* stack */
(Addr) info.init_eip /* Where to jump */
);
/*NOTREACHED*/
assert(0);
}
